title: [Embryonic sex determination during early pregnancy by X chromatin of chorionic cells (author's transl)].
mesh_terms: D002823:Chorion / Q000648:ultrastructure*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D011247:Pregnancy; D012728:Sex Chromatin; D012732:Sex Determination Analysis